Bio with Abdalrahman AlOmari
مبادرة جامعتي
The copying of DNA is not remarkable in its speed and accuracy
True
False
DNA is a polymer of nucleotides
True
False
Replication begins at particular sites called.........
Topoisomerase
Origins of replication
Replication fork
Primase
................ Is an enzyme that untwist the double helix at the replication fork
Helicase
Topoisomerase
Single-strand binding proteins
Primase
The rate of elongation is about 50 nucleotides per second in bacteria and 500 per second in human cells
True
False
DATP supplies .......... to DNA and is similar to the ATP of energy metabolism
Adenine (A)
Guanine (G)
Thymine (T)
Cytosine (C)
DNA polymerases add nucleotides only to the free 3′ end of a growing strand
True
False
The antiparallel structure of the double helix affects replication
True
False
The lagging strand is synthesized as a series of segments called Okazaki fragments, which are joined together by DNA .........
DNA pol III
Helicase
Ligase
Primase
Eukaryotic chromosomal DNA molecules have special nucleotide sequences at their ends called .......
Telomeres
Primase
Nucleoside
None of the above
The ........ Leads to the rectum and anus
Liver
Colon
Appendix
Cecum
Bile is made in the liver and stored in the .........
Stomach
Salivary glands
Gallbladder
Pancreas
The .......... Connects to the stomach
Esophagus
Pharynx
Salivary glands
Oral cavity
........... Is the junction that opens to both the esophagus and the trachea
Salivary glands
Gallbladder
Small intestine
Pharynx
Chief cells secrete inactive pepsin ?
True
False
HCl converts pepsin to pepsinogen ?
True
False
The ........ Is the longest compartment of the alimentary canal
Large intestine
Esophagus
Small intestine
None of the above
Risk for heart disease increases with a high LDL to HDL ratio
True
False
One of the following is lymphoid progenitor cells
Neutrophils
T cells
Erythrocytes (RBCs)
Monocytes
The hormone erythropoietin (EPO) stimulates erythrocyte production when O2 delivery is high
True
False
Red blood cells, or erythrocytes, are the most numerous blood cells
True
False
Cells and cell fragments occupy about 55% of the volume of blood
True
False
€¦â€¦â€¦â€¦â€¦...are organs that filter lymph and play an important role in the body’s defense
Lymph nodes
Blood capillary
Tissue cells
Arteriole
€¦â€¦â€¦â€¦â€¦â€¦ that control flow of blood between arterioles and venules
Arteriole
Thoroughfare channel
Precapillary sphincters
Capillaries
The blood is returned to the heart in conceder of
Skeletal muscle
Venule walls
Smooth muscle
All of the above
Nitric oxide (NO) is a major inducer of vasodilation
True
False
Vasoconstriction is the relaxation of smooth muscles in the arterioles; it causes blood pressure to fall
True
False
The …………… division slows down the pacemaker
Sympathetic
Hormones and temperature
Parasympathetic
None of the above
The contraction, or pumping, phase is called ………
Diastole
Atrioventricular (AV) valve
All of the above
Systole
Diving mammals can store oxygen in their muscles in ………… proteins
Myoglobin
Heamoglobin
Antibodies
None of the above
€¦â€¦â€¦â€¦.. Are agents that cause diseases
Pathogens
Antibodies
Epitope
Antigen receptors
The small, accessible part of an antigen that binds to an antigen receptor is called an ……….
Pathogens
Antibodies
Epitope
Antigen receptors
Lung volume increases as the rib muscles and diaphragm contract
True
False
Antigen receptors are generated by random rearrangement of
RNA
Protein
None of the above
DNA
The remaining cells in the clone become long-lived …………. That can give rise to effector cells if the same antigen is encountered again
Memory cells
T cells
B cells
All of the above
A pus, a fluid rich in …….
White blood cells
Dead pathogens
Cell debris from damaged tissues
All of the above
Lymphocytes that mature in the thymus are called……….
T cells
B cells
Antibodies
None of the above
Lymphocytes that mature in the bone marrow are called………
T cells
B cells
Antibodies
None of the above
Antigen fragments are bound to cell-surface proteins called major histocompatibility complex (MHC) molecules ?
True
False
Metaphase is characterized by …………
Splitting of the centromeres
Aligning of chromosomes on the equator
Cytokinesis
Separation of sister chromatids
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
Prophase
Anaphase
Metaphase
Interphase
If there are 40 duplicated chromosomes in a cell, how many centromeres are there?
10
20
30
40
Which of the following is released by platelets in the vicinity of an injury?
MPF
Cyclin
Cdk
PDGF
How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
4
8
16
64
Starting with one molecule of glucose, the energy-containing products of glycolysis are _____.
2 NAD+, 2 pyruvate, and 2 ATP
2 NADH, 2 pyruvate, and 2 ATP
6 CO2, 2 pyruvate, and 2 ATP
2 FADH2, 2 pyruvate, and 4 ATP
The process shown in the image correspond to :
Major histocompatibility complex (MHC) molecules
Antigen fragment
Pathogen
Antigen presentation
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