Ribosomes are very small non-membranous organelles that can either exist freely in the cytoplasm or be embedded in the endoplasmic reticulum of a cell; they are associated with the synthesis of
a. lipids.
b. proteins.
c. nucleic acids.
d. carbohydrates.
Answer: b. proteins.
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If the effects of death are imposed on the birth
rate of a population,
a. the growth rate will slow down. b. the time scale of population growth changes. c. eventually, as the environment is overexploited, deaths will exceed births. d. an exponential growth curve will be produced if births exceed deaths at a constant level. e. all of these will occur.
Even the replication of DNA and the expression of genes depend on the action of ____________________. Fill in the blank(s) with the appropriate word(s)
People often refer to chimpanzees as monkeys. What characteristic(s) do chimpanzees lack that monkeys have?
A. protruding noses B. a tail C. nails D. binocular vision
What is the total magnification of a microscope if the ocular lens is 10x and the objective lens in place is 32x?
a. 40x b. 100x c. 400x d. 320x