The concept presented to explain the origin of eukaryotic cells, namely that a bacterial cell parasitized another descendant cell of the last common ancestor and eventually became a permanent part of that cell as its mitochondrion or chloroplast, is called square

The heart is actually (one, two, or three)pumps? View Available Hint(s) three pumps one pump two pumps

Match each lymphoid cell with its function. 1. May defend against a kidney transplant square v (Click to select) Dendritic cells Natural killer cells 3. B lymphocytes T lymphocytes Macrophages 2. square presented to them by APCs acteria get through the skin 4. May ingest and destroy bacteria square square 5. Give rise to cells that secrete antibodies square v

By adding 10% catalase in this step instead of 5% catalase, what is being tested? Enzyme specificity Effect of pH on the reaction Effect of concentration of the enzyme

The HPA axis is a component of the stress response. The HPA axis regulates all the following EXCEPT: hormones that promote growth Cortisol Inflammatory Response Immune Response

A biologist counts the number of rabbits in a population each year and observes a decrease in population. Since the coyote population has exploded the biologist concludes that the coyote population has had a negative impact on the rabbit population. Which describes the biologist's actions? experimentation inference graphing interacting

Fill in the Blank Question The process of copying a DNA molecule so that there are two copies of the same DNA is called DNA square

Review 1. How are aquatic biomes defined?

Phagocytic white blood cells make up the first line of defense True False

The skin is a second line of barrier True False

Hot Questions

Even though it is not funny, the bone in the upper portion of the arm is called: humerus radius julna

This bone is commonly referred to as the tailbone. cranium sternum coccyx sacrum

According to class what specialized organ do male mosquitoes use to detect wing vibrations of females? Tympanic organs Chordotonal organs Johnston's Organ Setae

What is the role of enzymes? Concentrate products of chemical reactions. Speed up the rate of chemical reactions. Combine with smaller molecules to make larger ones. Act as substrates for chemical reactions.

The esophagus differs from the standard arrangement of the alimentary canal in that it has __ gastric glands stratified squamous epithelium Brunner's glands villi

Herbivores which only consume plants Secondary Consumers Primary Consumers

Which of the following is a vital function of the skin? The skin converts modified epidermal cholesterol to vitamin D. The skin absorbs vitamin C so that the skin will not be subject to diseases. The skin aids in desiccation The skin aids in the transport of materials throughout the body. The cells of the epidermis store glucose as glycogen for energy.

When our sensory receptors notice a specific stimuli, they convert that energy to an action potential and send that to the central nervous system. What is this process called? Sensation Perception Transduction Absolute threshold

The region of the brain stem positioned closest to the spinal cord is the: Medulla oblongata Midbrain Pons

The purpose of flame sterilizing your inoculating loop between each quadrant while creating your streak plate is to prevent outside microbes from contaminating your culture. True False