Which of the following structures is made of membranes? 

A. chromosomes
B. microtubules
C. endoplasmic reticulum
D. ribosomes


C. endoplasmic reticulum

Biology & Microbiology

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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.

Biology & Microbiology

Rank the elements carbon, sodium, calcium, and iodine in order of decreasing number of protons

A. CNaCaI B. ICaNaC C. ICCaNa D. CCaNaI

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology