Failure of which cell-cycle checkpoint is most likely to result in non-dysjunction?

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#Question id: 10943

#SCPH28 | Zoology

An 8-year-old male is frequently coming to the clinic for persistent skin infections that do not heal within a normal time frame. He had a normal recovery from the measles. Checking his antibodies following immunizations yielded normal antibody responses. A defect in which of the following cells would most like be the cause of the continual infections?

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#Question id: 3863

#SCPH01 Biochemistry

Introns in nuclear pre-mRNAs are excised by:

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#Question id: 11961

#I Life Science/ Life Sciences Group – I-V

The large surface area in the gut directly facilitates ________.

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#Question id: 4581

#SCPH06 I Botany

The Linnaeus classification system grouped organisms by ________.

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#Question id: 10804

#I Life Science/ Life Sciences Group – I-V

Major types of alkaloids, their amino acid precursors, and well-known examples of each type;

Alkaloid class	Biosynthetic precursor	Examples
A. Pyrrolidine	i. Lysine	a. Coniine
B. Tropane	ii. Ornithine	b. Retrorsine
C. Piperidine		c. Lupinine
D. Pyrrolizidine		d. Nicotine
E. Quinolizidine		e. Atropine and Cocaine

Which of the following combination from the given table is correct?