Cerebrospinal fluid
a. bathes the brain and spinal cord.
b. is colorless.
c. is formed from water and solutes that have
left capillaries in the brain.
d. includes all of these characteristics.
e. includes the characteristics of a and b only.
D
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Knight followed up on attempts of English farmers to improve varieties of agriculture with his studies on garden peas. When he crossed two true-breeding varieties, he found all of the following: Check all that apply.
_____ All the F1 offspring had the dominant trait. _____ If both parents have the same trait, then all of their offspring will also have that trait. _____ Some F2 offspring had the dominant trait and some had the recessive trait. _____ Among the F2 offspring, more had the dominant trait and fewer had the recessive trait.
A karyotype is a(n) __________
A. organelle of eukaryotic cells. B. stage of prophase I in meiosis. C. division of the cytoplasmic material following mitosis. D. organized representation of the chromosomes within a cell. E. None of the answers are correct
Based on the theory of natural selection, how would a beneficial mutation change the gene pool?
a. The beneficial mutation would spread slowly throughout the population increasing the frequency of the mutation. b. The beneficial mutation would spread rapidly throughout the population increasing the frequency of the mutation. c. The beneficial mutation would not spread throughout the population so the gene pool would not be affected. d. The beneficial mutation would spread rapidly throughout the population increasing the frequency of the mutation, but then slow down over time.
Some diseases are linked to the under or over expression of specific genes. A particular cancer is characterized by the overexpression of a gene. Do you predict the histones associated with this gene to be acetylated? Describe why this would lead to
increased gene expression and how histone acetyl transfer (HAT) and histone deacetylase (HDAC) could be involved. What will be an ideal response?