With the exception of identical twins, siblings who have the same two biological parents are likely to look similar, but not identical, to each other because they have
A) identical chromosomes but different genes.
B) identical genes but different chromosomes.
C) the same combination of traits but different genes.
D) a similar but not identical combination of genes.
Answer: D
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When a recipient cell acquires a piece of naked DNA from the environment, it is called
A. conjugation. B. transduction. C. transfection. D. transformation.
Robert Koch and his colleagues first used agar in bacteriological media. Why was this ingredient an improvement on previous materials used to culture bacteria?
A. Bacteria growing on the solidified medium did not degrade or break down the agar. B. Agar can convert from liquid to solid form, and back again, very easily. C. Agar is a complete source of nutrients for most bacteria. D. Agar was less expensive than the nutrients that Koch was previously using in the lab.
Phytoremediation is ____
a. rotating crops so that soil minerals are replenished b. replacing eroded topsoil so that plants can grow in the soil again c. plowing under all or parts of crops to improve the soil d. the use of plants to remove pollutants from the environment e. replacing unwanted plants with plants useful to humans
Small, circular DNA molecules that are located outside the main chromosome of bacteria and are capable of self-replication are ________
Fill in the blank(s) with correct word