Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) next to the question number (1.1 to 1.16) in the ANSWER BOOK, for example Which ONE of the following combinations results in genetic 1.11 D. variation in organisms? QUESTION 1 1.1 1.2 1.3 A Mitosis; sexual reproduction; mutations B Meiosis; asexual reproduction; mutations C Mitosis; meiosis; sexual reproduction D Meiosis; sexual reproduction; mutations The inheritance of one trait does not depend on the inheritance of another trait. This represents... Mendel's law of dominance. the law of codominance. C the principle of variation. D Mendel's principle of independent assortment. A B In bees, females are diploid and males are haploid. Females and males produce haploid gametes. This means that ... A females produce gametes by mitosis. B males produce gametes by meiosis. males produce gametes by mitosis. C D females have half the number of chromosomes that males have.
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
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