Which best describes why all plants need some sort of leaf or other green, leaf-like surface?

A) to perform photosynthesis

B) to stand upright

C) to be eukaryotic

D) to transport food

In biotechnology, sticky ends are Select one: a. DNA fragments cleaved by a restriction enzyme so that both strands are the same length. b. DNA fragments that carry a higher charge than normal after they have been cleaved by restriction enzymes. c.

An organism genotype is its 1. Genetic makeup 2. feather color 3. physical appearance 4. Stem height

Which cell structure is mainly responsible for releasing energy from food molecules in some single-celled organisms? (1) ribosome (2) chloroplast (3) cell membrane (4) mitochondrion

What is the goal of homeostasis and how is it maintained?

What is the relationship between cell size and the movement of materials into and out of cells?

you are running an experiment trying to figure out how water affects plant growth for three orchid plants you recently bought. The orchids are the same species and you will place the plants next to eachother in the same windowsill.

The living world is organized in levels. Biotic and abiotic factors also can be arranged into levels of biological organization. Put the words below in order from the least complex to the most complex

Which of the following, when taken up by the cell, binds to the repressor so that the repressor nolonger binds to the operator? A) ubiquitin B) inducer C) promoter D) repressor E) corepressor

Which of these organisms would be a producer? A. fish B. grasshopper C. flower D. snake

A 75 year old man need a replacement heart valve. he lives alone and cares for himself. is a mechanical or biological heart more suited for him