ATI Teas science

In biological chemical systems, an increase in the activity of an enzyme indicates that which of the following has occurred?

The enzyme has increased its effect on the rate of a chemical reaction

Which of the following will open at the appropriate intervals to allow stomach contents to pass into the duodenum?

Pyloric sphincter

Ribosomes are to protein as _____ is to DNA

RNA polymerase

Which of the following cellular organelles do not possess an outer encapsulating organellar membrane?

Ribosomes

The integrative functions of the nervous system require which of the following?

Sensory input

In humans, the majority of water obtained through oral intake is absorbed into the body through which of the following?

Small intestine

Which hormone inhibits the release of follicle-stimulating hormone?

Somatostin

Which of the following is a site of steroid hormone production?

Adrenal gland

Where does the diffusion of oxygen from inhaled air to the bloodstream occur?

Alveoli

Atomic weight

= atomic mass

For all biological nucleus acids, a nucleotide is composed of which of the following three components?

A phosphate group, a pentode sugar, and a nitrogenous base

In human cells, which of the following statements correctly states a true principle of the processing of genetic info?

A single, unique three base codon will code for only a single, unique type of amino acid

What cells mediate the cellular immune response by phagocytosis or ends this is for recognition of T-cells?

APCs

Emulsification of fats requires _______ and occurs in the ______.

Bile; small intestine

Bronchial epithelial cell membranes possess which of the following?

Cilia

Which protein is able to stretch and relax as muscles contract and relax?

Collagen

An organized functional collection of adipose cells is considered to be

Connective tissue

Oxygen enters the circulatory system during

Continuously throughout the entire respiratory cycle.

Which of the following cell types bind to PAMPs?

Dendritic cells

What is the electric charge of an atom with equal numbers of electrons and protons?

Energy electric charge of 0

In a single chromosome

Every functional gene can be transcribed into a mRNA molecule

What type of intermolecular bond can not be broken by human digestion?

Glyosidic

In humans, which of the following is true regarding dietary intake of proteins?

Inadequate intake during childhood development can lead to the disease kwashiorkor

In chemical reactions where a catalyst participates, the catalyst—— of the reaction by —- of the reaction

Increases the rate of the reaction; decreasing the activation energy

In immune functions involving T-helper cells, the T-helper cell most likely engage in which of the following?

Intercellular membrane binding

In a normal human, once blood is pumped out of the heart, which of the following statements is always true?

It passes through capillaries before returning to the internal chambers of the heart.

What molecule of responsible for transmitting genetic information to a cells ribosomes?

MRNA

What is the charge of an atom when the number of electrons exceeds the number of protons?

Negative

Ribosome construction occurs

Nucleoli

Which of the following is NOT a capacity of the human innate immune system?

Production of antibodies

What are two general structural categories of nitrogenous bases in nucleotide acids?

Purines and pyrimidines

In humans, urea is produced in which of the following locations?

The liver

In a covalent bond, two atoms share electrons in order to fill their

Valence shells