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3 years ago

SCIENCE QUESTION

Biology

2 answers:

Kazeer [188]3 years ago

4 0

Answer:

Explanation:

Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don't get their sugar from eating food, so they need to make sugar from sunlight. ... Because animals get sugar from the food they eat, they do not need chloroplasts: just mitochondria.

The basic plant cell has a similar construction to the animal cell, but does not ... It does have additional structures, a rigid cell wall, central vacuole, ... namely xylem, which is involved in structural support and water conduction, ... to provide energy, particularly when light isn't available for the chloroplasts to produce energy.

What structures does a plant cell have that an animal cell does not have? ... The centrosome is a region near the nucleus of animal cells that functions as a ... Vesicles and vacuoles are membrane-bound sacs that function in storage and transport. ... Like mitochondria, chloroplasts also have their own DNA and ribosomes.

4. Animal cells have centrosomes (or a pair of centrioles), and lysosomes, whereas plant ... Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for ... Like mitochondria, chloroplasts also have their own DNA and ribosomes. ... The central vacuole also functions to store proteins in developing seed cells.

5. Animals cannot use radiant (light) energy in this way. They must ... What change had the plant made to ... However, Earth's atmosphere has not always contained oxygen gas. During ... form of glucose or they eat other animals that ate plants.

alexandr1967 [171]3 years ago

3 0

Answer:

Animal cells have ribosomes for protein synthesis, unlike plants which use chloroplasts.

Explanation:

Animal cells do not have chloroplasts. Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells. The entire process is called photosynthesis and it all depends on the little green chlorophyll molecules in each chloroplast. Plants are the basis of all life on Earth.

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A couple who are expecting their first child has been advised by friends to consider harvesting umbilical cord blood in order to

vladimir1956 [14]

Answer:

Be used as source of reserve cells for the entire blood production system.

Explanation:

Stem cells can be described as special human cells that are capable of developing into many different cell types ranging from brain cells to muscle cells. They act like renewable source of replacement cells for treating diseases.

In this case, the proliferative potential and self-renewal of stem cells makes them a compensatory mechanism and reserve source for the entire hematopoietic system. While they could be of possible use in certain autoimmune conditions or in cases of organ failure, these statements do not capture their essence.

It should be noted that, hematopoietic system is the system comprising the organs that are involved in the production of components of blood. And this is the major reason why the couple should engage in the act after consulting the caregiver.

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3 years ago

Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of

WARRIOR [948]

Answer: gaps left at the 5' end of the lagging strand.

Explanation:

Eukaryotic Chromosomes are known as the repetitive at the very ends of chromosomes, found in a wide range of Eukaryotic species. They protect the end chromosomes from deterioration or fusion with the neighboring chromosomes.

Telomeres provide a mechanism for their replication by semi conservative DNA replication (a replication in which two parental DNA strands would act as a template for new DNA strands to be synthesized) and length maintenance by Telomerase Enzymes. Telomerase Enzymes are used to extend shortened telomeres during its’ DNA replication.

DNA replication in Eukaryotic Telomeres doesn’t begins at the either end of the DNA strands but starts in the center, and considering that all known DNA Polymerase ( an enzyme that is essential for DNA replication) read the template strand in the 3’ to 5’ direction, one finds a leading strand and a lagging strand on the DNA molecule being replicated.

On the leading strand, DNA Polymerase make complementary DNA strand without any difficulty because it reads the template strand from 3’ to 5’.

On the other hand, there is a difficulty going in the other direction on the lagging strand.

WHY? This is “due to gaps left at the 5’ end of the lagging strand”. To overcome this difficulty, short sequences of RNA acting as Primers (a short single-stranded nucleic acid utilized by all living organisms in the initiation of DNA synthesis) attach to the lagging strand, a short distance ahead of where the initiation site was.

I hope this helps alot!

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3 years ago

An increase in organ size and function caused by increased workload is termed a. atrophy. b. hypertrophy. c. metaplasia d. infla

V125BC [204]

Answer:

hypertrophy

Explanation:

Hypertrophy is the excess enlargement of a tissue. When a tissue or organ overgrow without any cell division, it is called hypertrophy. For example, muscular hypertrophy occurs when there is a very forceful and repetitive muscular activity as it occurs during strength training. It triggers enlargement of muscle fibers as myofibrils, mitochondria, and other organelles are produced more in number to support the excess workload of the muscles.

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3 years ago

Which of these does not occur in the Krebs cycle?

PilotLPTM [1.2K]

the answer you are looking for is B. Glucose is broken down into two pyruvate molecules.

this process occurs during glycolysis

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3 years ago

Elan Coil [88]

1) full, 2) new, 3) gibbous

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4 years ago

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