Why does a plant cell need a cell wall of cellulose whereas an animal cell does not?

This is a type of resource that is replenished by a natural resource faster than it is consumed.

Lightning occurs mainly during which stage of thunderstorm formation?

A scientist makes a discovery that suggests a hominid species created and used relatively sophisticated tools. The scientist decides to publish his findings.

2. In a certain plant, the allele for red flower color (R) is dominant over the allele for white flower color (r). A cross is performed between a plant with red flowers and a plant with white flowers.

Which of the following describes a relationship of parasitism? A. Oxpecker birds eat parasitic ticks off the backs of zebras. B. Birds feed off the insects that are stirred up from the grasses as cattle move through. C.

Homologous structures (Group of answer choices): A. are also called analogous structures. B. have identical functions. C. are shared by organisms of the same genus. D. have fully divergent functions. E.

Which of the following is true of an enzyme? (mark all that apply) a. it is a protein b. it is a catalyst c. it binds to many different substances d. it is small compered to its substrates

Which term would be applied to a regulatory condition that occurs when protein is associated with a particular section of DNA and greatly reduces transcription? A) induction B) negative control C) stimulation D) positive control E) activation

1. The reproductive parts of angiosperms are located within the called the and the female part is called the The male part is 2. In angiosperms, pollen produces cells. Pollen sticks to the female and travels down the style to the ovary.

Why would over-inflating the cuff of the sphygmomanometer be a problem for the patient?