Ribosomes are made up of:
A. protein and RNA.
B. only protein molecules.
C. only RNA molecules.
D. DNA and RNA.
E. only DNA molecules.
Answer: A
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What helical forms are adopted by double-stranded RNA?
A. There is evidence for B-form RNA in viruses. B. There is no evidence that A-form RNA occurs in cells. C. The A form is the only form found for double-stranded RNA in cells and in viruses. D. There is evidence that Z-form RNA occurs in cells under certain conditions. E. The A form occurs only in the laboratory.
“Double fertilization” produces nutrient tissue by the
union of a. two egg nuclei and one sperm nucleus. b. two sperm nuclei and one egg nucleus. c. two sperm nuclei and two egg nuclei. d. one sperm nucleus and endosperm mother cell nuclei. e. two sperm nuclei and one endosperm mother cell nucleus.
__________ is the process of maintaining a constant
internal environment. a. Hybridization b. Osmostasis c. pH adjustment d. Homeostasis e. None of these
For some human traits, two possible alleles exist. For other traits, multiple (more than two) alleles for the trait are present in the population. Which of the following is an example of a trait controlled by multiple alleles?
A) albinism B) blood type C) hemophilia D) color blindness