Which one of the following statements does not accurately describe the sex chromosomes?
A. The X chromosome has a gene density
similar to most autosomes.
B. In contrast to the approximately 1000
genes on the X chromosome, the Y
chromosome contains only about 50 genes.
C. The relative size and gene content of the X
and Y chromosomes is very similar across
species.
D. Crossing over between the X and Y
chromosomes occurs in very small regions of
homology between the two chromosomes.
E. Crossing over between the X and Y
chromosomes allows the sex chromosomes
to align correctly during metaphase I and
separate from each other during anaphase I.
C
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Microtubules are associated with ________
A) cilia B) flagella C) cell shape D) all of the answer choices
Which ion is pumped into guard cells in order to make them more flaccid?
a. Na+ b. Ca2+ c. K+ d. H+
Neurotransmitters act by binding to receptors that are
a. ligand-gated ion channels. b. located in the cytoplasm. c. tyrosine-kinase receptors. d. not coupled to G proteins.