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