When preparing vaccines, which of the following is the basis for the most effective and long-lasting immunity?

a. live viruses
b. killed viruses
c. subunit viruses
d. DNA viruses


a. live viruses

Biology & Microbiology

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One advantage of angiosperm seeds is the presence of seed ____, a nutritive tissue produced during fertilization that nourishes the developing embryo.

a. a coat b. endosperm c. ovule d. pollen sac e. ovary

Biology & Microbiology

Which of the following can waterproof cell walls, allowing for structures such as watertight conduction channels?

a. lignin b. hemicelluloses c. pectin d. cellulose e. chitin

Biology & Microbiology

When a diploid cell divides by mitosis, the result is __________

A) identical haploid cells B) identical diploid cells C) unique diploid cells D) unique haploid cells E) a zygote.

Biology & Microbiology

The HOBBIT gene in an embryo helps to control the development of what structure?

A. root B. epicotyl C. cotyledon D. endosperm E. root hair

Biology & Microbiology