Rickettsias differ from chlamydias in that rickettsias A) Are gram-negative. B) Are intracellular parasites. C) Require an arthropod for transmission. D) Form elementary bodies. E) Lack cell walls.

How do the three types of RNA work together at a ribosome to synthetize A polypeptide?

The pine borer beetle is a parasite to the pine tree. What would most likely happen to the pine tree population if the beetle population decreased? Decrease Increase Become extract Stay the same

Infiltration is generally greater than Run off where the land has a 1. Gentle slope and permeable soil 2. Gentle slope and impermeable bedrock 3. Steep slope and permeable soil 4 steep slope and impermeable bedrock

The occurrence of large or small beak size among seed crackers in the absence of medium sized beaks is an example of 1) directional selection 2) disruptive selection 3) normal distribution 4) stabilizing selection

In biology class, zia had to determine which of two fertilizers was best for growing african violets. she tested not just for type of fertilizer but also for its concentration and frequency of use. zia used

What is an adaptive immune system

What is feedback cycle?

Which statement describes all types of matter? a. it takes up space and has mass. b. it is made of carbon, hydrogen, and oxygen. c. it is made of proteins and carbohydrates. d. it is composed of organic materials.

What is the balanced equation for photosynthesis

Why is it important to use greek or latin words for scientific names?