Some prokaryotes attach to other substrates by hairlike outgrowths, which are shorter than flagella. These are called
A. endospores.
B. flagellin.
C. pili.
D. plasmids.
E. fission products.
C. pili.
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The outer segments of cones and rods contain ____
a. metabolic machinery b. light-inhibiting photopigments c. light-absorbing photopigments d. synaptic terminal e. ciliary muscles
Gene therapy ____
a. has not yet been used successfully with mammals b. is a surgical technique that replaces defective genes with normal genes c. has been used successfully to treat victims of autosomal dominant disorders by replacing the dominant allele with a recessive allele d. is a genetic engineering technique that replaces defective alleles with normal ones e. is only possible in adults
Risk factors for atherosclerosis include factors that can raise the levels of blood cholesterol, such as
A) obesity, smoking, and a sedentary lifestyle. B) regular exercise and a high-fat diet. C) dieting and REM sleep. D) sedentary lifestyle, low-fat diet. E) maintaining homeostatic blood pressure.
Factors which provide a measure of biodiversity in a particular ecosystem include
A) the total number of species in that ecosystem B) the variability of the individual genes C) the relative abundance of each species D) the number of different habitats being utilized E) All of the choices are correct.