A holoenzyme
consists of an apoenzyme plus a cofactor
is inactive
is a non-protein component of an enzyme
an enzyme without an active site
The Correct Answer is A
A. Consists of an apoenzyme plus a cofactor:
A holoenzyme is the complete, active enzyme composed of the protein portion (apoenzyme) together with its required nonprotein component (cofactor or prosthetic group); the holoenzyme is catalytically functional.
B. Is inactive:
The inactive form is typically the apoenzyme (enzyme protein without its cofactor); the holoenzyme denotes the active, fully assembled enzyme.
C. Is a non-protein component of an enzyme:
Non-protein components are cofactors or prosthetic groups; the holoenzyme includes both protein and non-protein parts, so it is not solely the non-protein component.
D. An enzyme without an active site:
An enzyme lacking an active site would be nonfunctional and is not the definition of a holoenzyme; holoenzymes contain the active site within the apoenzyme and are functional when combined with their cofactors.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. rRNA only: Some genes encode ribosomal RNA, but not all genes are limited to rRNA.
B. tRNA only: Some genes encode transfer RNA, but genes can encode other RNA types or proteins as well.
C. mRNA and polypeptide only: Some genes encode mRNA that is translated into polypeptides, but genes also encode functional RNAs that are not translated.
D. Any of the above: A gene can encode rRNA, tRNA, or mRNA (which may be translated into a polypeptide), so any of these products can be specified by different genes.
Correct Answer is C
Explanation
A. Aerobe: An aerobe requires oxygen for growth or grows optimally in the presence of oxygen; this does not indicate tolerance for oxygen-free conditions.
B. Obligate aerobe: An obligate aerobe requires oxygen and cannot grow in oxygen-free environments.
C. Facultative anaerobe: A facultative anaerobe can grow in the presence of oxygen (using aerobic respiration) and also grow without oxygen (by fermentation or anaerobic respiration), making it able to exist in both conditions.
D. Microaerophile: A microaerophile requires oxygen at lower-than-atmospheric concentrations and generally does not grow in oxygen-free environments.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.