Which of the following structures is made of membranes?
A. chromosomes
B. microtubules
C. endoplasmic reticulum
D. ribosomes
C. endoplasmic reticulum
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Rank the elements carbon, sodium, calcium, and iodine in order of decreasing number of protons
A. CNaCaI B. ICaNaC C. ICCaNa D. CCaNaI
The evolution of flowers and insects is an example of ____
a. parallel evolution b. homologous species c. coevolved species d. convergent evolution e. divergent evolution
The endoplasmic reticulum is a site for
A) potassium storage in muscle cells. B) drug detoxification by catalase. C) N-linked glycosylation of polypeptides. D) addition of lipid residues. E) degradation of foreign material brought into the cell by phagocytosis.
Brown-eye genes are dominant over blue-eye genes. What is the best explanation for the fact that all the blue-eye alleles have not disappeared in the human population?
A) Some blue alleles are always hidden in heterozygotes. B) The population is likely in Hardy-Weinberg equilibrium for that locus. C) Brown-eyed people sometimes have a blue-eyed parent. D) People with brown eyes tend to choose mates with brown eyes, and blue-eyed people tend to choose mates with blue eyes.