Viruses don't make their own proteins because they are not cells. A virus is a nucleic acid enclosed in a protein coat, and does not contain organelles. Bacteriophages, viruses that target bacteria as a host, inject their genetic material into the host bacterial cell. Therefore, cells don't even need proteins, (not including their protein coat) so they do not make them.
*Keep in mind that since there are no organelles, there are no ribosomes for the RNA (ribonucleic-acid) to deliver the coded message and amino acids to.
Answer:
Because viruses do not have their own cellular mechinary. They lack enzymes for replication of DNA and to produce their protein.
Explanation:
Gene
The answer is C) gene.
B. The breakdown of glucose into pyruvic acid
c. Krebs cycle
2. Within the light-independent reactions, what can be said about the 3-carbon-atom molecules produced?
A. Some of these molecules are converted back into 5-carbon-atom molecules to regenerate the cycle.
b. All of these molecules leave the cycle to make sugars
.
c. All of these molecules are combined with carbon dioxide.
3. Which of the following accurately describes the patterns of inheritance in human blood types?
A. Three alleles code for blood types and three phenotypes are possible.
B. Allele IA and IB are codominant, and allele i is recessive.
c. Allele i is dominant over alleles IA and IB.
4. A cell can only grow so large in size, because
A. its surface-to-volume ratio decreases as the cell becomes larger.
b. its ability to exchange materials would happen more quickly as the cell grows.
c. its surface-to-volume ratio decreases as the cell becomes smaller.
5. Which of the following accurately describes the relationship between photosynthesis and cellular
respiration?
a. Cellular respiration provides photosynthesis with oxygen and sugar.
b. The reactants of photosynthesis are the products of cellular respiration and vice versa.
c. All living organisms must choose only one of these processes for their entire lives.
Answer:A is the answer
Explanation:
Answer: transitional
Explanation: took the test right now
2. prophase
3. metaphase
4. telophase
Chromosomes attach to spindle fibres by their centromeres during metaphase of mitosis.
Further Explanation:
Interphase is the resting phase or metabolic phase of a cell where it prepares itself for the cell division process. Interphase comprises of sub-phases namely, Gap1 phase, Synthesis phase and Gap2 phase. G1 is the first gap phase where a cell grows larger in size and the cytoplasm volume increases as more organelles are produced. During Synthesis phase, the strands of DNA replicates. G2 is another gap phase in which the cell becomes much larger in size and this phase is followed by mitosis where cell division occurs.
Mitosis or somatic cell division is comprised of four phases which includes prophase, metaphase, anaphase and telophase. A somatic cell divides to give rise to two identical daughter cells where each cell contains exact copy of each chromosomes present in the parent cell. In the prophase, the envelope that covers the nucleus and nucleolus disappears and chromosomes become visible by forming two chromatids attached to centromere.
In the metaphase, chromosomes alignment at the metaphase plate occurs and spindle fibres attach to the centromere. Spindle fibres pull the chromatids away from the metaphase plate towards the opposite poles of the cell during anaphase. In the telophase, nuclear membrane reforms, chromosomes decondense and nuclear membrane reforms around each daughter nuclei. The cytokinesis is the final stage of cell division process where the parent cell is pinched off to result in two daughter cells.
Learn more:
1. Learn more about carbohydrate brainly.com/question/6947177
2. Learn more about cell brainly.com/question/1420458
3. Learn more about blood brainly.com/question/1213217
Answer Details:
Grade: High school
Subject: Biology
Chapter: Cell division
Keywords: Mitosis, prophase, metaphase, anaphase, telophase, interphase, cytokinesis, somatic cell, nucleolus, nucleus, centromere, chromatids, spindle fibres.
B. rock cycle
C. carbon cycle
D. nitrogen cycle
D.) nitrogen cycle is the biogeochemical cycle when nitrogen is converted into many different chemical forms and circulates among the atmosphere, terrestrial, and marine ecosystems. It is not a major cycle on Earth, like the air cycle (which we need to breathe), the rock cycle (e.g, weathering and erosion), and the carbon cycle (involving carbon dioxide and photosynthesis).