Scientists recently identified a gene that is linked with ovarian cancer. Variations in the KRAS
gene occur in one-quarter of women with ovarian cancer. Thus, KRAS is considered a
__________.
a. type of stem cell
b. genetic marker
c. vector
d. DNA profile
B
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Which choice is the most likely reason(s) for your answers in the two previous questions?
a. bacteria were clumped near algal filament areas exposed to yellow and orangelight b. high oxygen production is likely the result of high rates of photosynthesisassociated with yellow and orange wavelengths c. bacteria were clumped near algal filament areas exposed to red and blue light d. high oxygen production is likely the result of high rates of photosynthesisassociated with red and blue wavelengths e. both c and d are correct
The female gametophyte is the
a. flower. b. ovule. c. embryo sac. d. carpel. e. ovary
The recessive phenotype of a trait occurs in 16% of a population. What is the frequency of the dominant allele?
A. 0.48 B. 0.60 C. 0.40 D. 0.36 E. 0.16
The principal force driving movement in diffusion is _______.
a) membrane surface area b) concentration gradient c) temperature d) particle size