DNA ligase creates covalent bonds between the bases of the two pieces of DNA. True or False?

Cytotoxic T cells can attack target cells with which of these chemical weapons? A) secrete strong acid B) secrete organic solvent C) secrete free radicals D) secrete a cytokine that triggers apoptosis E) secrete mutant proteins

At rest, which of these plays a role in establishing the charge differential across a neuron's plasma membrane? at rest, which of these plays a role in establishing the charge differential across a neuron's plasma membrane?

One of the guidelines for responsible drinking is to

A niche is part of an organism's habitat. t/f

Compare and contrast producers and consumers in an ecosystem.

Water changes temperature easily. true or false

redwoods are the tallest species of tree in the world. explain how transpiration causes water to travel from the roots to the branches of a tree this size.

During photosynthesis, chloroplasts use light energy to convert carbon dioxide and water into sugar and oxygen. Which term best classifies the energy stored in the products of photosynthesis?

What did Chargaff discover while studying bases in the DNA of organisms? The bases in the DNA of each organism were unique. The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.

What is one way a plane can form?