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- Question
Which of the following are involved directly in pulmonary circulation?
Options- A. left ventricle, aorta, and inferior vena cava
- B. right atrium, aorta, and left ventricle
- C. superior vena cava, right atrium, and left ventricle
- D. right ventricle, pulmonary artery, and left atrium
- Correct Answer
- right ventricle, pulmonary artery, and left atrium
ExplanationRight ventricle (which pumps blood to the lungs), pulmonary artery (which carries blood to the lungs), and left atrium (which receives blood from the lungs) are involved directly in pulmonary circulation.
- 1. Which of these is unique to flowering plants?
Options- A. double fertilization
- B. an embryo surrounded by nutritive tissue
- C. haploid gametophytes
- D. pollen production Discuss
- 2. Heritable variation is required for which of the following?
Options- A. Evolution
- B. Asexual reproduction
- C. Mitosis
- D. Meiosis Discuss
- 3. Which of the following is not correct concerning nerves?
Options- A. Axons make up a majority of the matter in a nerve.
- B. Nerves are collection of axons of either sensory or motor neurons but not both.
- C. Nerves are covered by an outer sheath called the epineurium
- D. Nerves consist of parallel bundles of myelinated and nonmyelinated axons. Discuss
- 4. Which of the following statements about ddntps is true?
Options- A. They have a hydrogen at the 3? carbon of the sugar.
- B. DNA polymerase can add a new dNTP to a 3? ddNTP.
- C. They have a free 3?-hydroxyl group on the ribose sugar.
- D. They have an oxygen at the 2? carbon of the ribose sugar. Discuss
- 5. Which of the following vitamin helps in clotting of blood?
Options- A. Vitamin K
- B. Vitamin D
- C. Vitamin B1
- D. Vitamin B2 Discuss
- 6. Which is not a function of the cytoskeleton?
Options- A. helps the cell move
- B. gives cell a shape
- C. prevents chromosomes from separating
- D. None of the above Discuss
- 7. To what kingdom do common bacteria belong
Options- A. Archaea
- B. Protista
- C. Eubacteria
- D. All the above Discuss
- 8. Is yeast a fungus or bacteria? Discuss
- 9. DNA is made of repeating units called
Options- A. Nucleotides
- B. Ribozomes
- C. Peptides
- D. Aminoacids Discuss
- 10. Which nitrogenous base is not found in dna?
Options- A. Uracil
- B. Thymine
- C. Cytosine
- D. Guanine Discuss
Biology problems
Search Results
Correct Answer: double fertilization
Explanation:
In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.
Hence, double fertilization is unique to flowering plants.
Correct Answer: Evolution
Explanation:
Heritable variation is one of the four most important factors that affect whether natural selection can occur. These factors include
1) Heritable variation
2) Descent with modification
3) Struggle for survival, and necessarily if the others are satisfied
4) Survival of the fittest.
Heritable variation allows for possibly beneficial, negative, or even neutral mutations to get filtered during each generation by natural selection--weeding out negative mutations, passing on positive and neutral ones. Without heritable variation, species would quickly fall victim to parasites who take advantage of identical genetic material in a population and evolution would not occur.
Variation is the raw material of evolution.
Correct Answer: Axons make up a majority of the matter in a nerve.
Explanation:
Axons make up a majority of the matter in a nerve is the one statement regarding nerves is incorrect.
Correct Answer: They have a hydrogen at the 3? carbon of the sugar.
Explanation:
ddNTPs - Dideoxynucleotides and abbreviated as ddNTPs.
They are chain-elongating inhibitors of DNA polymerase, used in the Sanger method for DNA sequencing.
They have a hydrogen at the 3? carbon of the ribose sugar.
Correct Answer: Vitamin K
Explanation:
Vitamin K helps in clotting of blood. It is used by the body to help blood clot.
Warfarin (Coumadin) is used to slow blood clotting. By helping the blood clot, vitamin K might decrease the effectiveness of warfarin (Coumadin).
Correct Answer: prevents chromosomes from separating
Explanation:
A cytoskeleton acts as a frame that gives a cell its shape, protects it to an extent, and helps with cellular motion.
Correct Answer: Eubacteria
Explanation:
There are two kingdoms of bacteria. They are
1. Eubacteria and
2. Archaea
The members of these two kingdoms appear similar in shape and appearance, even under the extreme magnification of the electron microscope . However, they are very different from each other in a number of molecular and biochemical aspects. It is these differences that have resulted in the microorganisms being grouped into separate kingdoms.
For example, eubacteria contain the rigid, stress-bearing network known as the peptidoglycan . The only exceptions are the bacteria from the genera Mycoplasma and Chlamydia. Archaebacteria do not contain peptidoglycan. Instead, they contain a different structure that is called pseudomurein.
The common bacteria belongs to Eubacteria kingdom.
Correct Answer: Yeast belongs to members of the Kingdom Fungi Yeast are single-celled microorganisms that are classified, along with molds and mushrooms in Fungi family Yeasts are evolutionally diverse and are therefore classified into two separate phyla, Ascomycota or sac fungi and Basidiomycota or higher fungi, that together form the subkingdom Dikarya
Correct Answer: Nucleotides
Explanation:
DNA is a very long chain polymer made up of thousands of repeating units called nucleotides.
Nucleotide Unit is composed of a phosphate group, a pentose sugar, and a nitrogenous base.
The sides of the DNA ladder are made up of alternating deoxyribose sugar -- phosphate group units.
Correct Answer: Uracil
Explanation:
A nitrogenous base, or nitrogen-containing base, is an organic molecule with a nitrogen atom that has the chemical properties of a base. The main biological function of a nitrogenous base is to bond nucleic acids together. A nitrogenous base owes its basic properties to the lone pair of electrons of a nitrogen atom.
In DNA, four bases have been found. They are
1. Adenine (A),
2. Guanine (G),
3. Cytosine (C) and
4. Thymine (T).
The first three of these bases are found in RNA also but the fourth which is Uracil (U) is absent in it.
RNA contains cytosine and uracil as pyrimidine bases while DNA has cytosine and thymine.
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