Each pollen grain produces two cells, one of which may develop into:a
a polar nucleus.
b. a pollen tube.
c. an anther.
d. a compound pistil.
e. a filament.
B
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Assume that a mutation occurs in the gene responsible for the production of hexosaminidase A, such that only about 50% of the enzyme activity is found in the heterozygote compared with a homozygous normal individual. If heterozygotes are phenotypically
normal, we would say that the mutant allele is ________ to its normal allele. A) epistatic B) auxotrophic C) recessive D) dominant E) gain of function
When you are standing upright, what is the primary mechanism that propels blood in your feet back to your inferior vena cava?
A. Contraction of smooth muscle in the walls of the leg veins B. Contraction of the left ventricle of the heart C. Recoil of elastic fibers in the walls of the leg veins D. Contraction of skeletal muscles in your legs E. The valves in the leg veins alternating between open and closed
Which of the following statements is true regarding the sexual life cycle of basidiomycetes? Select all correct choices
A. Spore precursor cells undergo meiosis and mitosis to form spores. B. Spore precursor cells only undergo meiosis to form spores. C. Spore precursor cells only undergo mitosis to form spores. D. Fruiting bodies are composed of both haploid (1n) and dikaryotic (n+n) cells. E. Fruiting bodies are only composed of dikaryotic cells (n+n).
Where are calcium ions stored within muscle cells?
a. Golgi apparatus b. sarcoplasmic reticulum c. cisternae d. nuclear envelope