WORLD OF CELL+ACCESS CODE >CUSTOM<
17th Edition
ISBN: 9781323628669
Author: Hardin
Publisher: PEARSON C
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Chapter 23, Problem 1Q
You are working on a new species of sea urchin recently discovered in the South Pacific. You believe that release of calcium from internal stores is sufficient to trigger key events that are normally induced by a sperm cell in this species, as they are in other species. Explain how you could use the techniques mentioned in this box to test your idea.
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Explain why E is the correct choice.
Various types of stem cells that develop from the mesoderm are involved in processes by which all cells of the protostomes and Deuterostomes obtain or regulate ions, molecules, or monomers (nutrients). Therefore, these cells will perform which of the following processes?
a) Osmosis,
b) active transport,
c) facilitated diffusion,
d) exocytosis,
e) all are correct.
Design a hypothetical experiment to determine the role of microtubules in gamete nuclear migration during fertilization of a fruit fly Drosophila melanogaster.
3) In the human brain, an estimated average rate of 250,000 nerve cells are produced each
minute during gestation and through 6 months after birth.
a) How many nerve cells are in a healthy 6-month-old human brain?
i) 1.62 x 10³ nerve cells ii) 1.62 x 10¹¹ nerve cells iii) 1.62 x 10¹4 nerve cells
egg is
4) One of the earliest stages of fertilization that can be measured in a sea urchin
depolarization of the membrane around the egg. This occurs in 2 seconds. Egg and sperm
nuclei fuse at around 1200 seconds and the first division of the zygote is at 5500 seconds.
a) How many times longer does the process of nuclear fusion take than membrane
depolarization?
i) 2 times
ii) 100 times
iii) 600 times
iv) 1200 times
b) What is the maximum amount of time needed to synthesize a complete set of
chromosomes in the sea urchin zygote prior to its first division?
i) 2 seconds
seconds
ii) 1198 seconds iii) 1200 seconds iv) 4300 seconds v) 5500
Chapter 23 Solutions
WORLD OF CELL+ACCESS CODE >CUSTOM<
Ch. 23 - One effect of the hormone insulin is to cause...Ch. 23 - You are working on a new species of sea urchin...Ch. 23 - The Ca2+ concentration in unstimulated cells is...Ch. 23 - Prob. 23.3CCCh. 23 - Prob. 23.4CCCh. 23 - Prob. 23.5CCCh. 23 - Chemical Signals and Second Messengers. Fill in...Ch. 23 - QUANTITATIVE Pure agony. Agonists are drugs that...Ch. 23 - Heterotrimeric and Monomeric G Proteins. G...Ch. 23 - Calcium Chelators and Ionophores. In addition to...
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- The most notable differences between gamete formation in most animals and gamete formation in plants is that ______________. a) plants produce gametes in somatic tissue, whereas animals produce gametes in germ tissue b) plants produce gametes by mitosis, whereas animals produce gametes by meiosis c) plants produce only one of each gamete, but animals produce many gametes d) plants produce gametes that are diploid, but animals produce gametes that are haploidarrow_forwardFor this exercise, an electron micrograph of secretory cells of the anterior pituitary is being used (Sandborn, E.B. (1970) Cells and Tissues by Light and Electron Microscopy, New York, New York: Academic Press, Inc.). The image originally measured 18.7 cm wide and 18.5 cm high with a magnification of 5200x. Given the width of the original micrograph at 18.7cm, what is the true width of unmagnified image? Show calculations.arrow_forwardMYK-461 is also hypothesized to a) stabilize a head-head interaction in two-headed cardiac myosin. b) inhibit skeletal muscle myosin shortening. c) prevent myosin binding protein C from regulating actin-activation of cardiac myosin. d) accelerate ADP release, but only in the absence of actin. e) disrupt the OFF state of the thick-filament. Don't copy from Googlearrow_forward
- You are studying reproduction in starfish (also known as sea stars). You are able to successfully extract sperm and eggs from individuals in the lab and artificially fertilize the eggs. What is the second thing you expect to see (from this list) in the zygote/embryo after successful fertilization? Group of answer choices A. development of a barrier against sperm entry B. rapid cell division without growth C. rapid growth and cell division D. development of organsarrow_forwardWhat evidence do the authors provide to suggest that the interaction between Izumo1 and Juno is an important adhesion event but does not drive fusion between the sperm and egg.arrow_forwardA)How does a closed circulatory system function differently from an open circulatory system? And identify any benefits to an open circulatory system? B)Identify two differences (either structures or functions) between gills and lungs in terms of how oxygen is captured from the environment. C) Create a table that compares spermatogenesis and oogenesis. Include a bit of information about the hormonal control of reproduction in the comparison.arrow_forward
- Using specific molecular evidence, elaborate on the remark "oocyte activation entails inactivation."arrow_forwardClownfish are protandrous hermaphrodites. Determine whether the following features are encoded by the clownfish genome or are influenced by the proteome in response to the environment. The juvenile clownfish has both male and female immature reproductive organs. Clownfish are able to produce both testosterone and 17-estradiol. Genome encoded Increased estradiol levels lead to increased levels of proteins that promote the growth of female sex organs. Increased testosterone levels lead to increased - levels of proteins that cause male sex organs to develop Proteome influencedarrow_forward15. Which of these is not correct ? a) In mammals,acrosome reaction occurs when sperm contacts the granulosa layer. b) Resact is a sperm attractant found in the jelly layer surrounding the sea urchin eggs. c) Parental mating behavior ensures that eggs and sperm are delivered to each other. d) In humans, sperm must undergo capacitation before they can fertilize eggs e) None of the abovearrow_forward
- Control female AOX female DJ-1 female A. = ROS = Antioxidants B. Control female AOX female DJ-1 female = ROS = Antioxidants Control female AOX female DJ-1 female C. = ROS = Antioxidants Using the image above, which drawing (A, B, or C) do you think predicts the amount of ROS and antioxidants the sperm cell is exposed to. ROS is represented by the yellow star and antioxidants are represented by a blue asterisk. Remember that even though all the males were genetically identical and produced a normal amount of ROS and antioxidants, their sperm can still be affected by both ROS and antioxidants from nearby cells in the female's body. O A O B Ocarrow_forwardTemperature-dependent sex determination (TSD) is the method of sex determination in sea turtles. In TSD, temperature experienced during embryonic development determines the sex of the offspring. TSD is only observed in reptiles and teleost fish. The molecular mechanisms are not well understood, but the production of estrogen, which causes female development, seems to be critical. A potential pathway is shown in Figure 1.arrow_forwardWhich mechanism prevents an ovum from being fertilized by multiple sperm cells? Select one: a. When more than a single sperm cell fuses with the plasma membrane, multiple zygotes can form, leading to the conception of twins or triplets. b. When a sperm fuses with the plasma membrane of the egg, depolarization of the membrane occurs. c. Once a sperm penetrates the jelly-like coating of the egg, no other sperm cells can penetrate the coating. d. The egg can only survive in the Fallopian tube for 24 hours as it does not have mitochondria to produce energy.arrow_forward
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY