Most of the dry mass of a plant is derived from _____
A) NO3- and CO2
B) K+ and CO2
C) PO4 and K+
D) H2O and K+
E) H2O and CO2
Answer: E
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Which one of the following structures are found in the hindbrain?
A. cerebral cortex B. cerebellum and pons C. limbic system D. thalamus and hypothalamus
If a dividing cell had no functional Cdk2 protein, the cell would not be able to ____
a. phosphorylate cyclins b. transcribe the Cdk2 gene c. enter G1 d. translate cyclin mRNA e. degrade cyclins
Normal fruit flies have red eyes. Flies with mutations that block the function of the X-linked white gene have white eyes. The wild-type allele is completely dominant to mutant alleles. A white-eyed female fruit fly is mated to a red-eyed male. One of their hundreds of female progeny is white-eyed. This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during ________ in the ________.
A) meiosis I; mother B) meiosis II; mother C) meiosis I; father D) meiosis II; father E) meiosis I or II; mother
A virus reproduces by
A. laying eggs in a host cell. B. taking control of a host cell and directing it to produce viral components. C. the exchange of gametes. D. binary fission.