Efficiency is

a.

the percentage of energy lost to the surroundings as heat.

b.

the percentage of energy that is actually used to perform work.

c.

the entire amount of energy.

d.

the time it takes for half of the energy to be used.

Sucrose and lactose are disaccharides that have the same chemical formula, but have different characteristics and behave differently in chemical reactions. Which of the following generalizations can best explain this?

During transcription in eukaryotes, a type of RNA polymerase called RNA polymerase II moves along the template strand of the DNA in the 3'→5' direction.

Middle layer of the wall of an artery or vein allowing it to withstand and modify blood pressure is

A gardener is trying to win a competition for the largest pumpkin. Every year, she saves the seeds from the largest pumpkin in her garden. The next year, she plants only those seeds in a large plot.

What Best describes the advantage of using the model of a food web? 1. Shows feeding connections 2. Explains every detail of wildlife 3. Shows a complex mental model 4. Represents data collected from space

Your alien friend from planet Xenon is visiting and wants to learn how to breed pea plants. You show your friend a recent batch of pea plants with purple flowers that you grew by crossing plants that had purple flowers with plants that had white

The green stem ant has three (autosome) chromosomes. During meiosis, chromosome 1 and 3 separate normally, but chromosome 2 homologs do not separate during meiosis I. Meiosis II happens normally. What will the resulting cells of meiosis look like?

A population is growing at a rate of 2,4,8, 16, 32. Which type of growth does this describe?

Which epithelial tissue type is most often found lining large ducts, such as those of the salivary glands or pancreas?

Evolution led to certain fishes, such as lung fishes to adapt to terrestrial mode of life. These fishes were the ancestors of modern amphibians. Which evolutionary mechanism is represented by this example?