The enzyme ________ unzips and unwinds the DNA molecule. A) DNA polymerase B) helicase C) primase D) DNA ligase E) unzipase

Which of the following statements about DNA replication is TRUE? A) the leading strand is replicated continuously, while the lagging strand is replicated discontinuously B) the leading strand is repli

DNA replication results in two identical daughter molecules each consisting of one old (original) strand and one newly-synthesized strand. A) True B) False

Lysosomes are membrane-bound vesicles that arise from the A) nucleus. B) mitochondria. C) endoplasmic reticulum. D) Golgi apparatus. E) cell membrane.

Identify the choice in which the terms are arranged from smallest to largest, according to numbers of species they contain. a. biome > ecosystem >community > population b. population > biome > ecosyst

In the food web which organism is a producer? a. trees b. toadstools (fungi) c. trees and toadstools (fungi) d. red spider and toadstools (fungi)

When the equilibrium of an ecosystem becomes unbalanced, the populations in the ecosystem a. is likely to increase in number b. is likely to decrease in number c. will be made up of more predators d.

The ozone layer in the atmosphere a. determines global temperatures b. is responsible for the albedo effect c. is the region closest to Earth s surface d. reduces the amount of ultraviolet radiation t

An indicator species a. is an omnivore b. determines the type of ecosystem of a region c. lives in the water in one life stage and on land in another life stage d. provides an early warning that an ec

According to the diagram in Figure 1 , during the cycling of matter a. nutrients are returned to the abiotic environment by producers b. nutrients are returned to the abiotic environment by decomposer